Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb01e52329de5ee3…

MALICIOUS

PDF

40.3 KB Created: 2021-07-02 19:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0337677bbaa20b4d6f0b3563d2228b5 SHA-1: 822857a315c8c490219074b2ec546766244aa908 SHA-256: fb01e52329de5ee33352cf1d2d093a9d6bb540e3780840535290df39355e5c8d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is designed as an image-only lure, typical of phishing attacks, directing users to external links. Several heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites, suggesting it's a delivery mechanism for further malicious content. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9743

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab67e31110---pibawafiwuxubegikavepobuj.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf2l5qojceq9gf7v0me6hlhcd1/matatufolidogonavobep.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6efa4662140b172474660e87b9b499bd/64281085501.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/sivawozakefobakutinivov.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/70707860053.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/97876848291.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a416eca9d2e---tinixabapilatumitolubapub.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32a89ab6bc83088344dc2160057fb224/56587764629.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/46852558429.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/fadujuluzigenedidifip.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf363f87fdd---76435728232.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/puxidubi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1201ccf9---66126753643.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89d250e430---jawonatowuzipef.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/942f5747cfd5d154601db59b88a6bcb8/75104046255.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/ripuwuvatalebapulu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6c158a90---ligoxonezatero.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d26fbc3df---fewepewujorejoxosibosag.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tonajufikeziwetaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=funny+i+miss+you+more+than+quotesPDF link annotation

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